Carbon build-up inside tailpipe

[JoeC5]

While I was cleaning my truck I noticed a decent amout of carbon build-up inside the tailpipe. What do you think can be causing this? Truck runs great but my gas mileage is horrible. Truck has 124,x.. and has original FPR and 02 sensors etc... thanks

 

[Alec]

Maybe it's time to clean the MAS and change the FPR. See how that goes and if it's still bad we'll talk

 

[mrboyle]

I'd say it was the FPR as well.

 

[JoeC5]

Thanks fellas, I will change the FPR and see how that goes. thanks again.

 

[JoeC5]

I replaced the FPR today. Very easy task. See how the mileage goes this week. If not much of an improvement do you think i should replace the O2 sensors?

 

[james t]

did you check your fuel pressure before you changed the FPR? what about after?

 

[JoeC5]

I used the other method suggest on this website, fuel poured out after removal of the vacuum lines on the octopus. I think it was on the explorer maintenance page. Where is the Exhaust gas oxygen sensor located?

 

[jimbo74]

o2 sensor is located on the exhuast track bellow the header aroungd the collector/y-pipe area

 

[JoeC5]

Originally posted by jimabena74
o2 sensor is located on the exhuast track bellow the header aroungd the collector/y-pipe area

Thanks, I have a 93 so there should be 2 of them correct? Just one more question, whats that sensor located on the driver side of the intake manifold?